The invention belongs to the field of
solar cell manufacture, and particularly relates to a method for solving the problem of EL (electroluminescent) black spots of PERC (passivated emitter and rear cells). The method has the advantages that the aperture sizes of spray pins of water films are 0.8 mm, water film devices can slowly cover
silicon wafers, the
silicon wafer covering
water spray pressures of the water films can be relieved, the
silicon wafer laying pressures can be reduced, undesirable conditions that existing water films are splashed all around to contaminate existing surrounding silicon wafers can be effectively reduced on the premise that consistent
water flow is guaranteed, and the problem of the EL black spots of the PERC can be effectively solved by the aid of the method;the pressures of the water film devices can be relieved, the problem of falling of existing spray pins of the existing water films can be effectively solved, the problem of long-time pinhole blockingcan be solved, over-
etching due to insufficient water volumes can be prevented, equipment staffs only need to carry out irregular replacement and maintenance, and accordingly the time and labor can besaved; the problems of water film splashing, belt and silicon
wafer contamination and
etching contamination due to excessively high power and high pressures of the existing water films can be solved,the yield of efficient single crystals can be increased, the efficiency of the efficient single crystals can be improved, and the method has a broad application prospect.